Heat exchanger



D. K. DEAN HEAT EXCHANGER June 17, 1930.

Filed Jan. 11. 1928 INVENTOR ON /1. flf/I/V v wfid ATTORNEY Patented June '17, 1930 UNITED STATES PATENT OFFICE DION KANOUSE DEAN, OF RAHWAY, NEW JERSEY, ASSIGNOR TO FOSTER WHEELER CORPORATION, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK HEAT EXCHANGER Application filed January 11, 1928. Serial No. 245,853.

My present invention relates to heat exchangers of the tubular type where heat is transferred between two fluids one flowing through the individual elements of a bank or banks'of tubular elements and the other flowing around the individualtubular elements.

The object of my present invention is to pro vide an improved construction of a heat exchanger of the tubular type and more specifically, an improved construction and arrangement of the bafile system for so directing and regulating the flow of the fluid externall of the tubular elements that the path of ow of said fluid is substantially normal to the tubular elements throughout its passage through the heat exchanger and the velocity of flow of said fluid is substantially in creased. I p

The various features of novelty which characterize my invention are pointed out with particularity in the claims annexed to and forming a part of this specification. For a better understanding of the invention however and the advantages possessed by it reference should be had to the accompanying drawings and descri tive matter in which I- have illustrated an described a preferred embodiment of the invention.

Of the drawings: Fig. 1 is a sectional elevation of a preferred form of my invention;

Fig. 2 is a section on the line 2-2 of Fig. 1;

Fig. 3 is a section on the line 3--3 of Fig. 1; and i F Fig. 4.- is a plan section on the line 4-4 of the drawings I have illustrated a preferred embodiment of my invention in which a tubular heat exchanger A having a cylindrical shell A, a circular tube sheet B secured at one end to the shell A and a circular floating tube sheet 0 mounted at the opposite end thereof. Eachof the latesB andG is formed with a pluralityof tu e openings for tubular elements D, divided into up 1 and lower banks D and D respective y. A convex headerEis secured to the floating tube sheet G and a similar header F closes that end of the changer is provided with a circular header G5 divided into upper and lower chambers G and G "respectively, by a transverse diaphragm G A pipe connection I-I provides a fluid inlet opening to the chamber-Gr and a pipe connection H provides a fluid outlet from the chamber G.

With the construction described a fluid entering through the pipe H flows through the lower bank of tubes D through the reversing chamber formed by the tube sheet C and header E, then through the upper bank of tubes D and out through the chamber G and pipe H. It is immaterial in my invention whether or not the fluid flowing through the tubes D is the hot or cold fluid or whether the direction of flow is as described or the reverse. For the purpose of this description the flow is as described and the cooling fluid baffle K extends beyond the vertical center line but less than the inner diameter of the shell leaving a space between the edge of the baflle and the shell.

A series of circular bafiles M and N arranged-alternately are mounted in the shell A transversely to the horizontal baflie K. Each bafile M and N is connected to the bafiie K by a fluid tight joint. In the construction shown the joint is made by providing horizontal slots K M and N in the baflies K, M an'd -N, respectively, and fittin the battles M and N in the corresponding lots in the baflle K'with the slotted portions of the baflies M and N engaging the portions oithe battle K to the rear of and in alignment with the corresponding slots K Longitudinal tie baflles P are provided at spaced points .on the inner surface of the shell, A for holdingthe transverse bafiies M and Nv in position. The bafilesP are connected to,

i tube sheets B and 0. As shown in Fig. 2, the I nection between the transverse battles and the Each of the baflles M and N is provided with a set of circular openings for the tubular elements D. Each circular baffle M has its lower left or thirdquadrant substantially cut away to form an opening M as shown in Fig. 2. Each baflie N has its upper left or second quadrant cut away to form an opening N as shown in Fig. 3. The transverse baflies are thus formed with openings alternately on opposite sides of the bafiie plate K.

The compartment formed by the tube sheet B and first baflie M is connected at its upper left side, as seen in Fig. 2, to a fluid inlet pipe Q, and the compartment formed bythe last baflie N and the tube 'sheet C is connected at its lower left side to a fluid outlet pipe Q. In assembling the heat exchanger of my invention the tubular elements and the baffles are connected together as a unit and inserted into the shell A. This mode of assembly is advantageous in that the unit may be bodily removed for cleaning or repairs.

With the bafile construction described the heating fluid enters through the pipe Q,

. through the upper side of the first chamber,

thl01l%1 the passage between the edge of the baffle and the shell A, down through lower half of the chamber and out through the opening M into the next chamber. In that chamber the flow is the reverse of the flow in the first chamber, the fluid entering in the third quadrant and passing out through the second quadrant of the second chamber. As shown in Fig. 4 the heating fluid follows the above described path of flow through each pair of compartments, finally passin out through the outlet pipe Q. The ba es P restrict the flow to the portion of the chamber occupied by the tubes D. I

The flow therefore between each pair of transverse baflies is normal to the tubes D for substantially the whole circular path. With this arrangement of battles, the path of flow is substantially increased in length and decreasedincross-section for heat exchangers of given overall dimensions, with a resultant increase in fluid velocity and heat transfer 7 While in accordance with provisions of the statutes, I. have illustrated and described in the form of the apparatus. disclosed with-; out departing from the spirit of my invention as set forth in the appended claims and that in some cases-certain features of' myinvention may be used to advantage without a corresponding use of other features.

- -Having now describedmy invention, what I claim as new and desire to secure by Letters Patent, is:

1. A heat exchanger comprising a longitudinal bank of tubes through which a fluid is passed, a series of pairs of transverse baflies at spaced points along said tube bank, an opening in one sector of one of the baflles of each pair, an opening in an adjacent sector in the other baflle of each pair and a longitudinal baflle extending between said sectors, whereby a second fluid is passed through a substantially circular flow path between each pair of adjacent bafiles.

2. A heat exchanger comprising a shell,

a series of pairs of transverse bafiles mounted at spaced points along said shell, a longitudinal bank of tubes extending through said bafiles and containing a fluid, a pair of tube sheets connected to opposite ends of said tube bank, a fluid inlet connected to said shell between one of said tube sheets and one of said baifles, a fluid outlet connected to said shell between another of said baflies and the other of said tube sheets, a bafile extending longitudinally of said tube bank, and an opening in each of said transverse baflles, said openings being so arranged with respect to each other and said longitudinal battle that a path of flow from said fluid inlet to said fluid outlet is rovided substantially normal to said tubes t rough all quadrants between each pair of adjacent baflles.

3. A heat exchanger comprising a shell, a

longitudinal tube bank in said shell, a series of transverse baflles at spaced points along said shell, a baflie extending longitudinally of said shell, and connections between said last mentioned bafiie and each of said transverse baflles comprising interengaging slotted edge portions. I e

4. A heat exchanger comprising a bank of tubular elements, a series of transverse bafiles spaced axially of saidtubular elements and having apertures therein through wh1ch'sa1 d tubular elements pass, and a plurality oftie baflles parallel with saidtubular elements and in interlocking engagement with each of said transverse baflles.

f tubular elements, a series of tran'sversebaflies spaced axially :ofilsaid. tubular elements and I having apertures therein for the passage of saidtubularelements, a baflie extending axially of said tubular. elements, interlockin connections between said lastmentionedba v 'fle and s'aid transversebaifles, and ,a plurality each of said transverse jbaflle'sg I f 6.' A heat exchanger comprisingfla shell, a '1longitudinallyyextending bank 1 f tubes'in said f'shell through fluid is passed,

5 A heat exchanger comprising a bank of I of. tie baffles parallel ,with said tubular e le-1 ments and ininte'rlocking engagementiw th izo a pluralit of longitudinally spaced smooth faced ha es extending transversely of said tubes, a fluid opening adjacent the eriphery of each of said transverse bafiles, and separate baflle means extending between adjacent transverse baflies and arranged to direct a second fluid through an arcuate flow path of over 270 normal to said tubes.

7. A heat exchanger comprising a c lindrical shell, a longitudinally extending bank of tubes in said shell and through which a fluid is passed, a plurality of smooth'faced disc shaped bafiles extending transversely at l0ngitudinally spaced points in said shell, a eripheral opening in one sector of each ba e, the openings in adjacent baflles being arranged in adjacent sectors, and longitudinally extending baflie means extending between-said transverse baffles and arranged to direct a second fluid through an arcuate flow path normal to said tubes between the openings in adjacent baflies.

Signed at New York city, in the county of New York and State of New York, this 9th day of January, A. D. 1928.

DION KANOUSE DEAN. 

